Test device for determining contact-impact deformation index of metal material

Abstract

The invention discloses a test device for determining the contact-impact deformation index of a metal material. The test device comprises a hard metal block A, a hard metal block B, a soft metal block C, a thrust meter, a laser distance measuring sensor, a pushing device and a base; the pushing device is installed on the base, the thrust meter is installed on the pushing device, the pushing device can push the thrust meter to vertically move, and an ejecting needle is installed at the lower end of the thrust meter; the hard metal block A and the hard metal block B are made of a same metal material, the hard metal block A is fixed to the base, the hard metal block B is located under the ejecting needle of the thrust meter, the soft metal block C is clamped between the hard metal block A and the hard metal block B, the hard metal block A protrudes out relative to the hard metal block B, the laser distance measuring sensor is installed on the thrust meter, and a distance measuring head of the laser distance measuring sensor is aligned to the protruding part of the hard metal block A. The test device is simple in structure and easy to operate, the tested impact index is associated with the variety of the specific contact-impact materials, and the obtain impact index is more precise and better accords with practical application.

Description

technical field [0001] The invention relates to the technical field of metal materials, in particular to a test device for determining the contact collision deformation index of metal materials. Background technique [0002] In the analysis of mechanism motion, the high pair formed by two components through point contact or line contact is one of the basic kinematic pairs. In order to accurately calculate the wear caused by the relative sliding between the two components in the high-speed sub-set, it is often necessary to obtain the collision force and its material contact deformation information in the contact between the two components, and the relationship between the collision force and the material contact deformation is a power exponent (that is, the contact collision index) relationship, of course, during the contact collision process of components composed of two different metal materials, the relationship between the collision force and the material contact deformat...

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Problems solved by technology

[0004] At present, the calculation value of the power exponent in the contact collision is derived theoretically, but the key factor of the similarities and differences in the characteristics of metal materials is not considered in the theoretical derivation. In fact, the corresponding power exponents are different for different materials in contact and collision, such as figure 1 Shown is a schematic diagram of the collision of two metal materials (material 1 and material 2). Material 1 and material 2 slide relative to each other along the common tangent direction during the contact collision, and their relative sliding speeds are V1, F N and F N ' is the normal collision force of equal size and opposite direction, the relationship between the collision force and the deformation is F N =Kδ n (1), where K is the stiffness coefficient, δ is the amount of deformation, n is the power exponent of contact deformation, that is, the deformation index of contact collision, the actual collision force, K and n are different when different materials contact and collide, so the theoretical derivation The results are inconsistent with the actual situation and are difficult to apply. As a result, the industry has not yet given a method for determining the deformation index corresponding to different contact collision metal materials, and it is also impossible to determine the contact collision index of metal materials through effective test equipment.

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